I use most of them that you mentioned, and at one time was upset with myself for hanging on to them. After a while though, I realized that they are just words, and not literal. I might also say Kiss my ass, Go fuck yourself, stupid bitch/dickhead/asshole, etc. They are just expressions I was raised with which express emotions or meaning. Granted, I may used expletives more often than I should, but I don't think I'm promoting religion by saying such things.

I would add “Jesus, Fuck!” as one I use. Have been know to use “Oh, god” to indicate pleasure, and “God-daaaaaamn” upon seeing someone really hot.

Having written this question, and reading responses, I have really noticed of myself that I do use quite religious expressions. Having been raised with no religion (I only noticed I was not Christian when I was 12 and my friends were getting commencement gifts; in my town you were Christian unless proven Jewish; upon short contemplation I noticed I did not believe in God, so it all made sense), I certainly did not learn them at home. I do not think I learned them from a partner or location. I think I must have started ironically

I say things like "Lord have mercy (on my [poor] soul)" "Sweet mother of Jesus" "Heavens above" "Lord save us"

?????

Sure. It's just part of the shared cultural heritage. I don't use "I'll pray for you" because that personalizes it into an expression of personal religious belief. I might say "it's colder than a witch's tit" but that doesn't mean I believe in witchcraft or witches, or that in those who call themselves witches that there is some sort of thermal anomaly to their tits vs. the tits of the non-witches.